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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf441c4cf61832376badb8ddd826c1b99f5eb2d4a2c1abf217c4a4ab38898fe' 
  AND token = '1CC/2lBIs6wr3/yoaaF43buN85ccXfa0BvobjsHhnwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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