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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353ec722ac9857e852001c55b0fd9331da4ca6c74e5d8d31cf8749849e4d3fcd' 
  AND token = 'dPpCxK0kbMwYb+A/XXEgBuZ3dilHre5/f0Icq/FNYrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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