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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfb237c07db8a47b095b54a8ce21c1f5fd66ec3f78dc46ed01ac67ddbc46023' 
  AND token = 'aktzNs3YcXWZm0Q9wA2WVNgJydMSSc9H/YqhCYvc99o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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