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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccd989d48201ce713138602ef29a5bf780802de40926e98e5e91286dd026a5b' 
  AND token = '6lL9EUT0Fz5rymTp04surv8eebOKuogSlarqU8OiLQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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