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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fdaa6ff3619d9550ec78630a006b32d8e752760fb411dff11a4c268b3f43ba' 
  AND token = '0N91kaEcc/UAWMPFEEFLL68u6ZMo6hdn03tuaNDp+/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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