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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795288781fc3088d5f24881f651c77bccf6e603d99dcf88c9d7a6cf5fba80506' 
  AND token = 'SsU7uIbZb8v6jRnjJKbt6Wv5X4q5QnGvNEjuUfkeukk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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