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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5aec0a43c26e9a4842440936bef20d8088bb84b0e040728730d1838453d6ec' 
  AND token = '9YNiPspMYVzADPb1LJt2K1flMKKI0bN6vp60438I6A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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