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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9f76882cdfcd58799bc654fe7cff7ef3b2a07f39c05c569a7428ce85cc8c26' 
  AND token = 'OPii+ujFveKXE/9Ijya40MIkn3d74J7RF949+hxVK74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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