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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7b0ab11d195992dd6324614327f25a8c27533ef25e38e798044b9bd107f17f' 
  AND token = 'ZLexR5UtRPaZfGA1GwPrav/uU3o466ie+SJWg4o7GSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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