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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c044e5604d83d9a381b27c1607b8c761a4bd0007c7eec3aaba21ce37ae456c1' 
  AND token = '59lDrYfSZyTwDL3RYNbKyovlMO73oeBg8NqIU8sEixQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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