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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908d9db739ba4e5546d8c58e8220d124a9a88ab863ad2b4210fc9749d6abd653' 
  AND token = 'M+ynWGkE9OQTym/a5K1zB8vnnDEw8OxPe7FDIXMfUBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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