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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a99074b957bdbba0e1042a94660e789ecc12410e94a712f6b6a5f07be50553' 
  AND token = 'WkxZBcyEV35nrB2Wf3g4T8+MCjlL2EloF26QvTYRHxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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