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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdf91a0e2cd9b3b15f49121993b23a1d4cef1b6a127f5993a331a8eb13ad353' 
  AND token = '5Nqf+1KXnpiuXQMO+sP8O738CfJ5sw1hJMdmE/tDGRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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