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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887f7dd5cfe5ff7a8993ce8f6ea9d2cae0a9a032d8a2fe2d96c2d4559d0b59dd' 
  AND token = 'ngheN+L0E32Y6P+NBh+2uvhfUN28x37gbI/MhHaBxN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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