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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b15990214e06e9f2f1a873157d2e69380bd9440c5058e0dcb9e59b507f6d508' 
  AND token = 'HbCJkTgTmQOLRIPPgaOox8E34p6pGKW+4A9LAX6jj50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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