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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39264d04fa74f6a732e9ecaef42d8aee0d19a1590b365f993007ee72c02054ff' 
  AND token = 'bah91f+u7XJ4f33mLahNvGeTZ7FU4Zzxc73INAnkLlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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