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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04480226b524785c8fbb9feb73ee062fc79172474456c05da1b8886ac82d04a3' 
  AND token = 'XgJSv2pZDBlYrORVz4Xh4pHfxk9kwhkE3U4zC6WceWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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