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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3974cd5188b8f1f36c013ba9559f37e472291ad8b314a2cfcf632fd5aebfd0f1' 
  AND token = '3vG5G7OEeEig+YwmAA++x+4Ra27rQws/QHLruxkbKO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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