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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97ae9c4a1300c8eb2f957facd371ab3ab6c6c1684b47649fe65cbc46d7a9b1f' 
  AND token = 'mP8QBERRFfae3iXC8Y8+cATHyhz+oHu89bIrGOFz43w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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