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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c19bed01bea387955c790adbe112a68f35ab5d469a3bd3be73e1bd8df9ad98' 
  AND token = 'BSD71I8u70Pjf0OqjDUEmJ8702HCYA73w6NVIN1vmZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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