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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdae6daa39a36b712c2784caaa3c7a881a0d05e4c5bdbf45a25b5d8ec5a5a55' 
  AND token = 'nKD4dHBKE7EBUYJb6llom4lyhkHy+QfdchQZG0lky3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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