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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1125f2c15e7118a04f1d77f1b9dfd83c9b69c463f62b5ad03098072ec09b536a' 
  AND token = '4i93tBQ0cjLt6QazGvlOncCExGtbA9Cr5TiuBOalRjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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