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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297dba2f9fcc0e720570105e282b8a06caa31ce0757747b5ea0cb3f15d861067' 
  AND token = 'jxrwbRQNNHsTk/1rEot/SpRIc8/qgnmwx29vQ3yqr7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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