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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c554c11e84a9aa6738a08fbd402e298c167ccf5c221f8f7cc52fa172eda1b5' 
  AND token = 'feZZg6+hznsDrHpSZTtcev71jaL2fVuuZ2uQvBXgDdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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