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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fea4bcbf38c6f4fce66a074f5d626fe3c858d799cc201ddff94f133544b812' 
  AND token = '8Juhb2Gwyb4lPJ13HjvZX/xi6TVacf3LTsPA060Jhjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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