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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62b5ae23b81a7d1615340652840536b021fe01bed16857e7f1958e2faa13e54' 
  AND token = 'u2O79jsrJuQ9XGwyYzW07iss+o8yeGJbwHURvNPAPNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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