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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd021e26dcddb329dd094318afda8ea5a751cec3631d3d24de5e267336bee955d' 
  AND token = '3CKv5n7Lll6T8NhNE0fd7CwkTriFDVhyQbrwk/2a7fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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