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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d79886281cf8df31bf2502f10fb9b16753bf0a65e7fd511178459e50773bbeb' 
  AND token = 'sIgVmYSEhL6WfdZkSptnpG/+srCrr48bujSjURsiNtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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