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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2683ee429d065c254c70ef9ec05c26e86ba6f3e648a254eb8ad39a57851354d2' 
  AND token = '1vRdeeKOhCSUbKj7dBlsI+hFPX7gLmujJ53aj89dXNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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