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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c96de06d6e795c8470a1da81a9af924a30ddbfc28d52834f35adc88ded33bec' 
  AND token = 'COGp5auR/2SAr7J45DRKcAqMGUmvq5GvHmY+M5VMCbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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