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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e4f829c903a8461e5103f51625e276897860f5693bf0f6ebf8b13726d5d44a' 
  AND token = 'eHz3npFLKI7Rue4xGtLallJ4lCD7pnYMTXpHeqz2fi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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