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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b510bf64f86edeb51c7fa7182528eae6f0b557c75aeb6223951a6b856d11e958' 
  AND token = 'cnnbChr018i+a1pz6tfob1sc82Lohi5jcSQEt8Kbv7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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