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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14ad8d6ba1c41e209698b27e282eb28d9d1f4840ef5878948f0edbf069b3415' 
  AND token = 'H+knUsxxhrzkFXUexHYJc4Kg5GxSicrCA0X+pKycZOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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