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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f705e1d342da739bbec63ea863788776d79436d8b900720d6ef0e1d617af1a' 
  AND token = '1s6xGBkZm1zDRQYcFaVMXKw3h9Os9YpjOPm3mLx65Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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