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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380ae2651aad2b86384a4f40b2c790f928964191a7c392d2fd0f05fa9425eaa8' 
  AND token = '6rHrrE1+TgpugiK2sAT5JZu8gblHQukiRHBczP0jNeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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