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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403397595cea13f62ba7f3d5f932930a7f0c37d731de31735833bb95e449ee41' 
  AND token = 'UpIZEJaeZA8+GmJCwaz1fqhrXthDLn8SuQMdYn5YdU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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