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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b03203f62b351abf6f909f6b4df7516adc1aefac3a49c994a43e07530e85bf3' 
  AND token = 'sGQtJkIsVaTJTxE7cJumY+eJvgKE2+khARYvdPKzIF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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