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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6799f4b63a39d1a4b03933a135502a26317ef77e725a7f7dab4e6d6d4fb6b77a' 
  AND token = 'kePeFJxRp/qZPyDpaquaHbfpCKU/Z/K1aJ4e4onGlzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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