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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5501560e9de4979a7d1ebf792645b69f93747034f724b3e67f9cc5fb78f5abb' 
  AND token = 'ceIDUwVPzdqZYPUmud6ugSzeN9ZH9VseZtV+IZ/Wfvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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