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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ca7ad758eb298fc6250f90484ef533d711a83a2dea1c3bfc81267cfbdc4407' 
  AND token = 'sjRVv+U38wMabMxExoO3Y+5UiezNX98t0VeTttMocJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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