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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571c040faf23f58225f09c4f6198a19f45b36fb7438f6a4e6776f8f0e05402b0' 
  AND token = 'jK2fWpCZrzgqiXGia88ZygRTcfjYfJUGJlWoYraxM8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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