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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fbb5fa1d8970dd765b1a1ac7c8597a6ea33308bf823ab03fb39e82347a7c6e' 
  AND token = '41p1PomUqVhGBhrKbl4Rx3cqvr/MhbRtcFxwNJIcm3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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