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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbf362d642fafe35aa6ba1ccae56c67ccc187b29eadf8672098ad7d45786829' 
  AND token = 'd82eHqgeTZM0Su/iIJ1LdHci3BpO61MB/EVKcvZuvLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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