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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0427fcf84252162058ae0129a67c07f46467f5c878f7ffcb870a9d97f026f8a6' 
  AND token = '3Pqm1C1eKrX84X73yCOpy+BuctGwheK8WH1WUQhWlWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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