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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acb06a6d0b44cd5ec9e6b82c1c54f159c36ff191dd51d146522eb951f81e102' 
  AND token = 'pW2jCXGY6fyp9I/mBimuIpYLeCSsex+nWtFj+IrkS44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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