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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc116b1b4fdce44a36d3e1a96b96c433497f343ba92510ab68c3b538d3243fb' 
  AND token = 'T2VlDvMYGn5d5+JyzzLcyEPQIy6inmNJwvlUEKX0g0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}