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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9a6870fe92ab7a3cc82f3ee6ded345d8326973222c6fb9ec3bd0e1b48fa19a' 
  AND token = 'QlCpdlZObQ0W3VymmMmeGij0DmCpEwJH6Dn78rCySOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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