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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3795c501e0b1e4cc01fcfacde46fa3e314c719fcc9e7dafab10d06cc56bdff3c' 
  AND token = 'ldY/cSo5dICC+ZT7e3tu+TloFeMLyerI5tRSji3QpPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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