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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b6c85b081c87ca474081ff80243217acac46ba8e7d71d45164cf548519aac5' 
  AND token = 'HGV3An2WZUEAjzqsWgQ9Fb+RsRakWkoF2uV3QE0xecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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