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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d88f69b17f614670904733842aead62cb7cb8c72c6b10e81c1929b65eb3fa2e' 
  AND token = 'glNR9CiDXxLwuDfnNFRVR/7IWKfOgUSbimYj/mb4/dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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