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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753d94875977fc376a065c5cb523ec78547345c23598fd52e2f695903f982b99' 
  AND token = 'icihRs4vMOVKmxMlgjhEOnbJyLzBFsjIHm8N656cjOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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