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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f74b9d6f76644f10ae9de511cd5005eba73ea88970288130c7c1c60bf0dcef7' 
  AND token = '3Y2KW/CpALeSpZzMrzuKNZ2px5b5O3kNZRPGuwwukWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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