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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5de20ff6f54d41de548a43112b831149b6aaa4996649c642e2bdd6403754e3' 
  AND token = 'Pkeo6otzGBvX7Kurc/FffO1VGGSpFFSWgxIow1Tt2xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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