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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e481db4a94254ba0cd4629ce919b92a4e0e49a3a38254ac37c815e4ed4414a' 
  AND token = '10Xl5vPUJVebO0VaNCKO1iCZZU4/4iqtleI64QgpCew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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