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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8285448ee212f7363c273cb715103ff74512d5ec1c0afbb2a23bc3002c75e8c' 
  AND token = '2aK046sTlLt9M4I25xR2ZLg0HvrfhCLs3uYu9JKE+HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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