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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea950cea9089820187b0ffa713849a59ea2f9af1aeda9a0688ba129365c94832' 
  AND token = '3kls3nP5Zpi6Aop4Ma9TzjH0i39A6+x9jOskEyuXeqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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