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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae22adf74778631be3e64c4d91528d672dbc77d9884c6fe0a40111c288084e8' 
  AND token = 'OVa1pe8l4A+A4FREmIiPdrU/ZZCxvab7omuP2SEqLjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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