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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23adc4a5e4fed56d8bc0f8b8090a64e0318a880eb60f4a74066e5f13e662cfd' 
  AND token = 'sZRf3FCi9DTAZZp/O0L7atHdpAtrL5F6zQeudNHY3cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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