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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e5b86fca49d42cfe85fc9b412db1f870470b704c890926ec58c360c029dfca' 
  AND token = '6aXXYCiDnW+K7evI7ejG9MnYZVbnwbAiLX+MGTTEY2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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