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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07880287f18e3ce71146258b60a23ed92caab6e18fccc1f6f97c29507157dd9d' 
  AND token = 'qXoyt+kvcd/YuCTkQs377w+kBvDHTWJNJJ2dIX4rlis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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