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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe4bb42f05a75d57e2ab49cacd161c152395710c1edb0bd6ca09324bed8ef97' 
  AND token = 'BDvTJey0mumrp5UDnXakj/SviEqBx0qLACdvuGGgfvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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