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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade7d4fca515ccfb3a9071e613c8db1db1bb633a60cb95cf236dd877c467e6a5' 
  AND token = '3ecBm/cY37vveMClx/Leh3B2oxM0Li7BijOivZuVDNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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