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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c727598ad18ac12ba977e75acc8ee643479becca8bfd52adcd9eef97ff5507af' 
  AND token = 'CHmqDi8U9+vOh0ir5ApOLJOKNz9fHhrOcCLzNYDd20M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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