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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27fdf3a3e1b3e01163424c6fef15599b65dd6b3998a193a87033f61f19d4eab' 
  AND token = 'fneViuLvVqnu/ialOltrIJsfU0xFBbJNK6QU1hk2JYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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