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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6279f2cc38c2899779e3a1449bde0426a41f481e4b9089dd220f1229f83371d0' 
  AND token = 'pRGzF230xLIF49TM9JZ8d8kxjwc+JEO5OfoCR1QGL1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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