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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7895847f74161bae11f61d02e50524d16fc329376dae08da3cd5d62f9b47878a' 
  AND token = 'NDZCxza/vBk/RkaxMqeSZTiQtjpif5oKz4sYN/nI42Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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