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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a172f4b91267430888234bc93061121850514a763758ee429e20353276aa3df' 
  AND token = 'g0vepPO5A73E5O8s5zz/A93f3G8LG7FjwBu9jPxkSt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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